feat: add system quality improvement plan and implementation

docs/sql/add_dictionary_table.sql

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+-- 字典表
+CREATE TABLE IF NOT EXISTS sys_dictionary (
+    id BIGSERIAL PRIMARY KEY,
+    type VARCHAR(100) NOT NULL,
+    code VARCHAR(100) NOT NULL,
+    name VARCHAR(100) NOT NULL,
+    value VARCHAR(500),
+    remark VARCHAR(500),
+    sort INTEGER DEFAULT 0,
+    create_by VARCHAR(50),
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    deleted_at TIMESTAMP
+);
+
+-- 创建索引
+CREATE INDEX IF NOT EXISTS idx_sys_dictionary_type ON sys_dictionary(type);
+CREATE INDEX IF NOT EXISTS idx_sys_dictionary_type_code ON sys_dictionary(type, code);